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    v1.0.28
    OpenPayerBilling CodesNoninfective enteritis and colitisICD-10-CM k51-ulcerative-colitis
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    ICD-10-CM Code For Ulcerative Colitis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group K51 includes diagnoses for ulcerative colitis and its specified anatomic extents and complications, covering conditions from proctitis to pancolitis and associated hemorrhage or fulminant disease. These ICD-10-CM diagnosis codes are used to document clinical encounters that capture disease extent, severity, complications, and surgical history related to ulcerative colitis. Accurate coding within the ICD-10-CM K51 group supports proper claim adjudication by reflecting clinical complexity and ensuring complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM K51: Ulcerative Colitis Overview

    The ICD-10-CM K51 group encompasses diagnoses for ulcerative colitis, a chronic inflammatory condition primarily affecting the colon and rectum. These codes represent varying extents and severities of mucosal inflammation and complications of the large intestine. Accurate coding supports appropriate reimbursement by reflecting disease complexity and guiding claim adjudication.

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    When to Use

    Use a code from this group when clinical documentation indicates a diagnosis of ulcerative colitis with specified anatomic involvement or complications. Codes from this group are selected to reflect disease severity, presence of complications like hemorrhage or toxic megacolon, and any documented postoperative status.

    ICD-10-CM Codes

    49 rows

    ICD-10-CM CodeDescription
    K51.00Ulcerative (chronic) pancolitis without complications
    K51.011Ulcerative (chronic) pancolitis with rectal bleeding
    K51.012Ulcerative (chronic) pancolitis with intestinal obstruction
    K51.013Ulcerative (chronic) pancolitis with fistula
    K51.014Ulcerative (chronic) pancolitis with abscess
    K51.018Ulcerative (chronic) pancolitis with other complication
    K51.019Ulcerative (chronic) pancolitis with unspecified complications
    K51.20Ulcerative (chronic) proctitis without complications
    K51.211Ulcerative (chronic) proctitis with rectal bleeding
    K51.212Ulcerative (chronic) proctitis with intestinal obstruction
    K51.213Ulcerative (chronic) proctitis with fistula
    K51.214Ulcerative (chronic) proctitis with abscess
    K51.218Ulcerative (chronic) proctitis with other complication
    K51.219Ulcerative (chronic) proctitis with unspecified complications
    K51.30Ulcerative (chronic) rectosigmoiditis without complications
    K51.311Ulcerative (chronic) rectosigmoiditis with rectal bleeding
    K51.312Ulcerative (chronic) rectosigmoiditis with intestinal obstruction
    K51.313Ulcerative (chronic) rectosigmoiditis with fistula
    K51.314Ulcerative (chronic) rectosigmoiditis with abscess
    K51.318Ulcerative (chronic) rectosigmoiditis with other complication

    Showing 1–20 of 49

    DRG Codes

    3 rows

    DRG CodeDescription
    385Inflammatory Bowel Disease with MCC
    386Inflammatory Bowel Disease with CC
    387Inflammatory Bowel Disease without CC/MCC

    Typical Clinical Scenarios

    • A young adult with a known history of ulcerative colitis presents to the emergency department with 3 days of worsening bloody diarrhea, abdominal cramping, fever, and tachycardia. Laboratory studies show elevated inflammatory markers and imaging suggests pancolitis; the acute flare requires inpatient IV steroids and close monitoring for complications, so an acute severe colitis code is assigned. Typical codes: K51.20, K51.211.
    • A middle-aged patient in outpatient gastroenterology follow-up has chronic left-sided colitis with ongoing intermittent symptoms controlled on maintenance therapy; colonoscopy last year showed chronic mucosal inflammation without dysplasia. The visit documents routine management of a chronic ulcerative colitis subtype and medication adjustment for maintenance, so a chronic localized colitis code is used. Typical codes: K51.30, K51.311.
    • An older patient with long-standing ulcerative colitis presents with progressive iron-deficiency anemia and weight loss; evaluation raises concern for colitis-related complications including stricturing and surveillance for dysplasia. Because the primary condition is chronic colitis with systemic complication and surveillance/management, a code reflecting ulcerative colitis with complication or chronic activity is assigned. Typical codes: K51.50, K51.519.

    Related Codes

    K50-CROHNS-DISEASE-REGIONAL-ENTERITIS

    ICD-10-CM Code For Crohn's Disease Regional Enteritis: Group Overview

    K52-OTHER-AND-UNSPECIFIED-GASTROENTERITIS

    ICD-10-CM Code For Other And Unspecified Noninfective Gastroenteritis And Colitis: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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